Abstract
The frequency of recombination exchanges per unit length of DNA (Freuld) can be estimated by measuring the scale of the genetic map that is the mean statistical distance between two neighboring crossovers. The scales appear to be equal for the alternative pathways of recombination, RecBCD (wild-type cells) or RecF ( recBC − sbcB − sbcC − genotypes). The absolute value of the scale depends on specific experimental conditions. recR, recQ, ruv, recJ, and recN genes of the RecF pathway of recombination ( recBC − sbcBC − cell genotypes) do not appear to be silent in wild-type cells where the RecBCD pathways predominates. On the contrary, these genes are responsible for the Freuld. The list recF504∷Km r > recQ61∷Tn3 > ruv-54 > recJ284∷Tn10 shows decreasing efficiency in inhibiting recombination exchanges by these mutations. The recN264 mutation gives a small, but opposite effects of increasing the frequency of recombination exchanges. The effect of the recF and recQ mutations appears to be additive, but that is not the case in combinations of ruv-54 with recF504∷Km r or recQ61∷Tn3 .
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